ESB-2017.2724 - [Win][UNIX/Linux] Atlassian Bamboo: Execute arbitrary code/commands - Existing account 2017-10-27

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2724
     Multiple vulnerabilities have been identified in Atlassian Bamboo
                              27 October 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Atlassian Bamboo
Publisher:         Atlassian
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-9514  

Original Bulletin: 
   https://confluence.atlassian.com/x/EZ-1Nw

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Bamboo Security Advisory 2017-10-11

Related content

Bamboo security advisories

Bamboo - Remote Code Execution - CVE-2017-9514

Note: As of September 2014 we are no longer issuing binary bug patches, 
instead we create new maintenance releases for the major versions we are 
backporting.

Summary				CVE-2017-9514 - Remote Code Execution in Bamboo

Advisory Release Date		11 Oct 2017 10 AM PDT (Pacific Time, -7 hours)

Product 			Bamboo

Affected Bamboo Versions	6.0.0 <= version < 6.0.5
				6.1.0 <= version < 6.1.4

Fixed Bamboo Versions		for 6.0.x, Bamboo 6.0.5 has been released with a fix for this issue.
				for 6.1.x, Bamboo 6.1.4 has been released with a fix for this issue.
				for 6.2.x, Bamboo 6.2.1 has been released with a fix for this issue.

CVE ID(s) 			CVE-2017-9514

Summary of Vulnerability

This advisory discloses a critical severity security vulnerability which was 
introduced in version 6.0.0 of Bamboo. Versions of Bamboo starting with 6.0.0
before 6.0.5 (the fixed version for 6.0.x ), 6.1.0 before 6.1.4 (the fixed 
version for 6.1.x) and 6.2.0 before 6.2.1 (the fixed version for 6.2.x) are 
affected by this vulnerability.

Customers who have upgraded Bamboo to version 6.2.1 or 6.1.4 or 6.0.5 are not
affected.

Customers who have downloaded and installed Bamboo >= 6.0.0 less than 6.0.5 
(the fixed version for 6.0.x)

Customers who have downloaded and installed Bamboo >= 6.1.0 less than 6.1.4 
(the fixed version for 6.1.x)

Please upgrade your Bamboo installations immediately to fix this 
vulnerability.

Remote code execution through YAML deserialization (CVE-2017-9514)

Severity

Atlassian rates the severity level of this vulnerability as critical, 
according to the scale published in our Atlassian severity levels. The scale 
allows us to rank the severity as critical, high, moderate or low.

This is our assessment and you should evaluate its applicability to your own 
IT environment.

Description

Bamboo had a REST endpoint that parsed a YAML file and did not sufficiently 
restrict which classes could be loaded. An attacker who can log in to Bamboo 
as a user is able to exploit this vulnerability to execute Java code of their
choice on systems that have a vulnerable version of Bamboo.

Versions of Bamboo starting with 6.0.0 before 6.0.5 (the fixed version for 
6.0.x ), 6.1.0 before 6.1.4 (the fixed version for 6.1.x) and 6.2.0 before 
6.2.1 (the fixed version for 6.2.x) are affected by this vulnerability. This 
issue can be tracked here: BAM-18735 - Remote Code Execution - CVE-2017-9514 
Resolved

Fix

We have taken the following steps to address this issue:

Released Bamboo version 6.0.5 that contains a fix for this issue.

Released Bamboo version 6.1.4 that contains a fix for this issue.

Released Bamboo version 6.2.1 that contains a fix for this issue.

What You Need to Do

Atlassian recommends that you upgrade to the latest version. For a full 
description of the latest version of Bamboo, see the release notes. You can 
download the latest version of Bamboo from the download centre.

Upgrade Bamboo to version 6.2.1 or higher.

If you are running Bamboo 6.1.x and cannot upgrade to 6.2.1 then upgrade to 
version 6.1.4.

If you are running Bamboo 6.0.x and cannot upgrade to 6.1.4 then upgrade to 
version 6.0.5.

Support

If you did not receive an email for this advisory and you wish to receive such
emails in the future go to https://my.atlassian.com/email and subscribe to 
Alerts emails.

If you have questions or concerns regarding this advisory, please raise a 
support request at https://support.atlassian.com/.

References

Security Bug fix Policy

As per our new policy critical security bug fixes will be back ported to major
software versions for up to 12 months for JIRA and Confluence. We will release
new maintenance releases for the versions covered by the new policy instead of
binary patches.

Binary patches will no longer be released.

Severity Levels for security issues Atlassian security advisories include a 
severity level and a CVE identifier. This severity level is based on our 
self-calculated CVSS score for each specific vulnerability. CVSS is an 
industry standard vulnerability metric. You can also learn more about CVSS at
FIRST.org.

End of Life Policy Our end of life policy varies for different products. 
Please refer to our EOL Policy for details.

Last modified on Oct 10, 2017

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